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EC number: 202-163-5
CAS number: 92-52-4
Only one study was allocated to this endpoint. The study (Klier et al., 1992) was considered relevant to demonstrating fate of biphenyl following chronic spillage to soil. Because biphenyl has been demonstrated to be readily biodegradable, no further testing concerning this endpoint is needed.
In the single available study, biodegradation
of biphenyl was examined in combination with phenol in a natural
soil/groundwater system obtained from a site historically contaminated
with hydrocarbons. At an initial concentration of 1 ppm in the
soil/groundwater mixture, DT50 values for mineralization ranged from 5
to 22 days, and monitoring of14CO2evolution
indicated ultimate biodegradation of 40-90% after 28 d, depending on the
soil used. Biodegradation was enhanced by addition of N and P: DT50
values of 1.5-3.5 d were obtained, whereas monitoring of14CO2evolution
indicated ultimate biodegradation of 40-50% after 36 d, depending on the
soil used. The study was considered reliable, but should be considered
that the combination with phenol may have affected the test results for
the individual substances (e.g., via co-metabolism), and although the
tests were conducted in closed systems with radiolabeled biphenyl, no
mass balance was presented. However, because up to 90% of applied
radioactivity was evolved at14CO2, it could be
assumed that the test system was suitable for containing the test
substance. Because the study involves soil with a history to
contamination, including with other substances, it was not used as Key
Study for this endpoint, but is still relevant to demonstrating
potential for ultimate degradation in soils.
Because biphenyl is demonstrated to be readiliy biodegradable, no
additional testing in soil is necessary or required.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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